If you want to convert any micro soft ost file and not findany tool try stella
micro soft ost to pst converter tool to convert all ostmailbox items in to pst file this software is convert all corrupted andunmounted ost mailbox items in to pst file this software is convert all version32bit and 64bit ost file this software is run all windows operating systemsthis software is convert all ost file items like emails, contacts, calendars, tasks,notes and many other items in to pst file. For more info visit this link
https://www.stelladatarecovery.com/ost-to-pst-recovery.html